Enhanced chemocatalytic reduction of aromatic nitro compounds by biosynthesized gold nanoparticles

Tahir, Kamran; Li, Baoshan; Khan, Shafiullah; Nazir, Sadia; Khan, Zia Ul Haq; Khan, Arif Ullah; Islam, Rafiq Ul

doi:10.1016/j.jallcom.2015.08.109

Cited by 45 publications

(10 citation statements)

References 49 publications

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“…Algae were considered to be a good nematode control alternative 63 while NPs, such as nanosilver, have been recently adopted for controlling plant pathogens, including nematodes 36 , 64 . Laboratory experiments have shown that 2 to 4 days of exposure time is required to reduce J2S counts in root-knot nematodes when comparing the effect of chemically synthesized AgNPs on J2s 22 . Our results are consistent with those of Abdellatif et al 61 , who used AgNPs incorporated into algal extracts from Ulva lactuca and Turbinaria turbinata to test the nematicidal effect on infected eggplants ( Solanum melongena cv.…”

Section: Discussionmentioning

confidence: 99%

“…Nanotechnology has recently been used to successfully manage pest-infected plant crops 2 , 5 , 16 – 21 . Furthermore, the use of silver nanoparticles (Ag NPs) has clarified anti-nematode effects 22 . However, chemical synthesis of silver nanoparticles is frequently prohibitively expensive, necessitates the use of toxic and hazardous chemicals, and poses potential environmental risks 23 .…”

Section: Introductionmentioning

confidence: 99%

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Nematicidal activity of seaweed-synthesized silver nanoparticles and extracts against Meloidogyne incognita on tomato plants

Ghareeb

El-Din

Maghraby

et al. 2022

Sci Rep

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The purpose of this study was to test the nematicidal activity of extracts of two marine algae (Colpomenia sinuosa and Corallina mediterranea) and their synthesized silver nanoparticles against root-knot nematodes (Meloidogyne incognita) that infest tomato plants. Scanning electron microscopy (SEM) revealed that nanoparticles had aggregated into anisotropic Ag particles, and transmission electron microscopy (TEM) revealed that the particle sizes were less than 40 nm. Fourier Transform Infrared Spectroscopy (FT-IR) analysis revealed that the obtained nanoparticles had a sharp absorbance between 440 and 4000 cm−1, with 13 distinct peaks ranging from 474 to 3915 cm−1. Methylene chloride extracts and nanoparticles synthesized from both algae species were used to treat M. incognita. C. sinuosa nanoparticles had the highest nematicidal activity of any treatment. Furthermore, and in contrast to other treatments, C. sinuosa nanoparticles reduced the number of nematode galls, egg-masses per root, and eggs/egg mass, while also improving plant growth parameters. C. sinuosa's methylene chloride extract was more active than C. mediterranea's, and the most effective eluent of this solvent was hexane: methylene chloride: ethyl acetate (1: 0.5: 0.5, v/v/v). When applied to M. incognita, the third fraction of this eluent was the most effective, resulting in 87.5% mortality after 12 h and 100% mortality after 24 and 72 h of exposure. The presence of seven bioactive constituents was discovered during the analysis of this fraction. In conclusion, the silver nanoparticles synthesized from C. sinuosa could be used as alternative chemical nematicides.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nematicidal activity of seaweed-synthesized silver nanoparticles and extracts against Meloidogyne incognita on tomato plants

Ghareeb

El-Din

Maghraby

et al. 2022

Sci Rep

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“…The gold decorated titanium dioxide (Au/TiO 2 ) nanocomposite was synthesized by a novel and ecofriendly green deposition method using phytochemicals from the aqueous extract of Ranunculus muricatus [ 13 ]. A novel and eco-friendly green procedure was developed for the synthesis of Au nanoparticles using stem extract of Salvadora persica [ 14 ]. Very few studies have been reported on actinobacteria; especially streptomyces spiralis being capable of synthesizing nanoparticles [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Actinomycete strain type determines the monodispersity and antibacterial properties of biogenically synthesized silver nanoparticles

Mabrouk

Elkhooly

Amer

2021

Journal of Genetic Engineering and Biotechnology

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Background Bio-nanotechnology is considered as one of the low-cost approaches that have been utilized in production of nanomaterials. The current research aimed at investigating the influence of different types of Actinomycete strains on the final properties of silver nanoparticles (AgNPs) such as size, shape, polydispersity, and antibacterial properties. For this purpose, the following techniques were employed UV spectrophotometer, SDS-PAGE electrophoresis, TEM, FTIR, antibacterial agar diffusion test, and Zetasizer. Results It was found that among 34 Streptomyces isolates collected from the soil, Streptomyces spiralis and Streptomyces rochei were able to reduce silver nitrate into sliver nanoparticles. The diversity and molecular weights of extracellular proteins secreted by these stains were different as proved by SDS-PAGE technique. This consequently resulted in differences in polydispersity of AgNPs which indicate that the sizes of AgNPs were highly dependent on the amount, molecular sizes, and diversity of extracellular matrix proteins of the microorganism. Conclusion This article might give an insight about the importance of molecular sizes of biomacromolecules such as proteins on the physical properties of biogenic synthesized nanoparticles.

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“…[15][16][17][18] Good biocompatibility is one of the most important requirements of inorganic NPs for in vivo applications. 19,20 SPIOs have been widely examined for toxicological effects both in vitro and in vivo. [21][22][23] Mn-IONPs may exhibit totally different cytotoxicity, however, because Mn 2+ -doping changes the crystal structure and increases the number of structural defects that disrupt the well structured electronic configuration of SPIO NPs.…”

Section: Introductionmentioning

confidence: 99%

Metabolic Conversion and Removal of Manganese Ferrite Nanoparticles in RAW264.7 Cells and Induced Alteration of Metal Transporter Gene Expression

Zhang

Xiao

Kang

et al. 2021

IJN

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Background: Manganese Ferrite Nanoparticles (Mn-IONPs) are widely used in biomedical field and their cytotoxicity has been initially explored, but the mechanism remains obscure. The nano-bio interactions are believed to be crucial for cytotoxicity mechanism, while little data have been acquired. Methods: Mn-IONPs were synthesized by thermal decomposition of acetylacetonate precursor. After physicochemical characterization, we analyzed the metabolic conversion and removal of Mn-IONPs in RAW264.7 cells by Prussian blue staining, TEM, HRTEM and elemental quantitative analysis, followed by gene expression evaluation using quantitative RT-PCR. Results: Mn-IONPs were successfully synthesized. Both the uptake and cytotoxicity of Mn-IONPs on RAW264.7 cells were time-and dose-dependent. After internalized, Mn-IONPs were passed to daughter cells with passages on. Meanwhile, Mn-IONPs were exocytosed and digested to metal ions and further excreted out, resulted in the labeling rate and ions contents decreased gradually. As ion influx related genes, the expressions of ZIP14, IRP2, FtH and DMT1 were suppressed within 24 hours but overexpressed to a plateau at the 48th hour in a dose-dependent manner. At the 72nd hour, ZIP14 and DMT1 mRNA levels decreased toward normal, while IRP2 and FtH kept up-regulated. As efflux related genes, FPN, SLC30A10 and Hamp2 genes were upregulated within 24-72 hours; SPCA1 was suppressed at the 24th and 72nd hour, while overexpressed at the 48th hour. All the efflux related genes' mRNA had a dose-dependent increasing manner at the corresponding time points. Conclusion: Mn-IONPs showed time-and dose-dependent cytotoxicity and cell labeling rate in RAW264.7 cells. Accompanying with the intracellular catabolic breakdown and exocytosis of Mn-IONPs, RAW264.7 cells also secreted and re-uptook manganese and iron ions to maintain intracellular homeostasis in the succeeding passages. And the metabolic conversion of Mn-IONPs in RAW264.7 cells can affect the expression of ZIP14, DMT1, FPN, SLC30A10, IRP2, FtH, Hamp2 and SPCA1 genes.

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Enhanced chemocatalytic reduction of aromatic nitro compounds by biosynthesized gold nanoparticles

Cited by 45 publications

References 49 publications

Nematicidal activity of seaweed-synthesized silver nanoparticles and extracts against Meloidogyne incognita on tomato plants

Nematicidal activity of seaweed-synthesized silver nanoparticles and extracts against Meloidogyne incognita on tomato plants

Actinomycete strain type determines the monodispersity and antibacterial properties of biogenically synthesized silver nanoparticles

Metabolic Conversion and Removal of Manganese Ferrite Nanoparticles in RAW264.7 Cells and Induced Alteration of Metal Transporter Gene Expression

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